JPH0327342B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises a grinding wheel movable in the radial direction of a grinding spindle relative to one another along a column.
Two grinding spindles cantilevered parallel to each other, a dressing device for dressing the grinding wheels, and a bed carrying a column in the axial direction of the grinding spindles and tangentially to the circumferential surface of the grinding wheels. The present invention relates to a grinding machine for profile grinding metal workpieces with complex surfaces, such as turbine blades, and a workpiece carrier that is movable.

Precision grinding of workpieces with non-flat and complex surface geometries is a complex problem that places high demands on machine tool construction and control. This is evident in the example of grinding turbine blades. Turbine blades are workpieces with complex and synthetic surface structures, in this case curved in planes and susceptible to damage themselves. The machining of such workpieces therefore often requires the grinding of a large number of different profiles of the same workpiece. For this purpose,
It has become known and common to connect a number of grinding machines, corresponding to the number of profiles to be ground, rigidly connected to one another, equipped with the tools required in each case, and to transport the workpieces to be machined from machine to machine. It is also a target. It is possible to connect the respective processing steps rigidly to each other in a patterned fashion or to connect them loosely to each other via suitable operating devices, but this requires considerable mechanical engineering costs and costs. It takes time and effort. That is, at least one machine is required for each grinding operation to be carried out, so that not only is the number of machines relatively large for the machining of such a single part, but also a series of coupling devices are required. Alternatively, operating equipment and fixing devices adapted to the particular operation must be prepared. In addition to this, long installation times, a relatively low utilization of the individual machines (as the working cycle time is determined by the longest operation) and the entire equipment if an individual machine becomes inoperable. downtime makes the operating efficiency of the equipment correspondingly uneconomical. Fixing the part in other machines, which is necessary for any grinding operation, creates the risk of creating unnecessary defects that impede the precision of the process.

Grinding machines are known which also make it possible to grind the profile of a turbine blade, with two parallel grinding heads, with which one workpiece can be machined simultaneously from opposite sides. However, in the case of this known grinding machine as well, the grinding of different surfaces and profiles requires the parallel connection of a number of machines, each equipped with tools that are each suitable for carrying out the desired work process.

A specially constructed grinding machine for grinding turbine blades is known from DE 21 22 763 A1. The turbine blades are ground on this machine using a profile grinding method, the shape of the figure being scanned and transmitted to the workpiece. Although this method is useful for grinding relatively large surface area blades of turbine blades, it is not suitable for grinding complex and synthetic profiles.

The problem underlying the invention is to develop a grinding machine of the type mentioned at the outset, which makes it possible to grind reasonably synthesized profiles with a high degree of precision even on workpieces with complex surfaces. It is about building.

The above-mentioned problems are solved by the present invention in the following manner in the above-mentioned type of grinding machine. That is, two grinding spindles are each cantilevered on two grinding spindle carriers which are slidably guided relative to each other along a column, and a set of grinding wheels of different diameters are provided one after the other. Supports the grindstone
Each grinding wheel axially continuous from the tip of the cantilevered grinding spindle has a larger diameter than the preceding grinding wheel, and said grinding spindle is associated with at least one dressing device having at least one dressing tool. the dressing tool has a complementary profile corresponding to the profile of the associated grinding wheel, and the workpiece carrier is rotatable about at least one axis and has at least one workpiece grip. a workpiece holder, each driving the rotation of the grinding spindle, the movement of the grinding spindle carrier, the movement of the dressing tool, the axial and tangential movement of the workpiece carrier, and the rotational movement of the workpiece holder; This solution is achieved by providing individually controllable drive means for this purpose. This machine makes it possible to produce different and composite profiles in successive working steps on workpieces with non-flat and complex surface shapes, without the need to change the fixation of the workpieces. In another embodiment of the invention, the grinding machine is constructed as follows. That is, on each of the grinding spindle carriers a frame carrying a dressing device is guided so as to be slidable in the radial direction relative to the grinding spindle axis, and said frame is movable guided parallel to the grinding spindle axis. and comprising holding means carrying the dressing tool on a drivable shaft, and individually controllable drives for the movement of the grinding spindle carrier and the frame and for the rotation of the dressing tool. Means are provided. In a preferred embodiment, one of the grinding spindles has three grinding wheels and the other grinding spindle has two grinding wheels. This construction of the grinding machine makes it possible to perform five different grinding operations on one material with the same grinding machine.

In order to bring the workpiece to be processed into the respective desired position of the grinding head with respect to the respective desired grinding wheel, the following further features are provided according to the invention. That is, a rotary head rotatable about a vertical axis on a feed table in which a workpiece holder with at least one workpiece gripper is rotatable about an axis parallel to the axis of the grinding spindle. and the feed table is movably guided transversely to the grinding spindle axis on a support movable in a horizontal plane parallel to the grinding spindle axis. A further improvement in the guidance of the workpiece in the direction of the tool can also be achieved as follows. That is, according to the invention, the rotating head is arranged in a turntable which is pivotable about an axis running horizontally transverse to the grinding spindle axis and which is pivotable about an axis perpendicular to the feed table. Supported. According to another aspect of the invention, individually controllable drive means are provided for the linear movement of the support and the feed table and for the rotational movement of the turntable, rotary head and workpiece holder. This expands the numerical control possibilities of the grinding machine proposed according to the invention. According to the invention, each of the grinding wheels supported on the grinding spindle has a different profile. This makes it possible for different surface sections of the workpiece to have different profiles within the machine, without the need for the workpiece to be unsecured and then fixed in another machine. The grinding machine proposed according to the invention therefore allows time-saving and cost-effective profile grinding even for complex composite profiles.

According to another embodiment of the invention, the dressing tool has on its circumferential surface complementary profiles axially next to each other that correspond to the profiles of all grinding wheels of the corresponding grinding spindle. In another embodiment, the dressing tool has one dressing wheel for each of the grinding wheels of the corresponding grinding spindle, the dressing wheels corresponding to the individual grinding wheels being arranged along the circumference of the grinding wheel. The single wheels are provided angularly offset from each other. A dressing tool corresponding to a grinding spindle is constructed according to the invention as follows. That is, a number of dressing wheels are provided on a common axis, each of which corresponds to one grinding wheel, and the diameters of the dressing wheels correspond. It is configured to have a step corresponding to the diameter of the grinding wheel. In this embodiment of the invention, the dressing tool is carried on a frame which can be slid along the grinding spindle carrier in the longitudinal direction.

In other embodiments of the invention, one dressing device or two dressing devices corresponding to the grinding spindle are provided on the feed table. In this embodiment, it is also possible to provide a common dressing device for both grinding spindles, which carries dressing tools with a number of profiles corresponding to the number of grinding wheels of both grinding spindles.

The grinding machine proposed according to the invention can be used even more rationally when the workpiece holder is provided with two workpiece grips that are offset by 180° with respect to its rotational axis. The workpieces fixed to the workpiece holder can be sequentially moved toward the grinding wheel by the workpiece holder to a working position.

In order to guarantee as uniform a circumferential speed as possible for grinding with grinding wheels of different diameters, according to the invention the grinding spindle is driven with a variable angular speed.
Therefore, when using a grinding wheel with a small diameter, the angular velocity of the grinding spindle will be high. The drive means for the various functions of the grinding machine according to the invention are first of all drives by individually controllable electric motors.

The invention will be explained in more detail below with reference to embodiments illustrated in the accompanying drawings.

FIG. 1 is a diagram illustrating the grinding machine proposed according to the invention without taking dimensions into account. In particular, bet 1, which has the height of the table, carries column 2,
In this column, two grinding spindle carriers 3, 4 are guided along guide rails 6, 6' in the longitudinal direction of the column 2 so that they can be moved toward and away from each other in the vertical direction. The grinding spindle carrier is driven by a spindle drive unit 7,
This is done by motors 9, 11 via 8.

Grinding spindles 12, 13 are rotatably supported in a cantilevered manner on the grinding spindle carriers 3, 4. The grinding spindles 12, 13 together with the respective grinding spindle carrier are movable relative to each other in the radial direction of the grinding spindles. Each of the two grinding spindles 12, 13 carries a grinding head 14, 16. According to the invention, the grinding head 14 has three grinding wheels 17, 17a and 17b arranged one after the other in the axial direction of the grinding spindle, of which the grinding wheels 17, 17a and 17b are arranged one after the other in the axial direction of the grinding spindle. Each axially succeeding grinding wheel has a larger diameter than the preceding grinding wheel. The grinding wheel 17 closest to the grinding spindle end has the smallest diameter, and the grinding wheel 17b furthest from the grinding spindle end has the largest diameter. Grinding spindle 13 mounted on second grinding spindle carrier 4
has a grinding head 16 with two grinding wheels 18, 18a arranged one after the other in the axial direction. In this case too, the grinding wheels 18 located close to the end of the grinding spindle are smaller in diameter than the diameter of the grinding wheels 18a that are further away from this end of the grinding spindle. The grinding spindle 12 is the motor 1
According to 9, the grinding spindle 13 is driven by a motor 21. The two grinding spindles are driven independently and independently of each other. Due to the fact that the diameter of the grinding wheels is enlarged from the free end of the grinding spindle in the direction of the grinding spindle carriers 3, 4 and the column 2, free access from the end of the grinding spindle to each of the grinding wheels is ensured. Ru.

The bed 1 is provided with guide rails 22, 22' parallel to the table surface above it, along which a support 23 is guided longitudinally in the direction of the arrow 24. For driving the support, a spindle drive 2 is operatively connected to a motor 27.
6 works.

Guide rails 28, 28' are provided on this support transversely to the direction of movement of the support 23, which guide rails are connected to the feed table 2.
9 is movably guided in the direction of the arrow 31 transversely to the direction of movement of the support. The feed table is driven by a motor 33 via a screw drive section 32. A workpiece carrier 34 is placed on the feed table 29.
is provided. This workpiece carrier consists of a rotary head 36 which is supported on the feed table 29 so as to be rotatable about a vertical axis. This rotating head 36 carries a workpiece holder 37 which is rotatable about a horizontal axis, in which a workpiece 38 to be machined is secured to a suitable fastening device. A motor 39 is connected to the workpiece holder 3 to rotate the rotating head.
A motor 41 is provided for rotationally moving 7. The above-described movement and support of the workpiece carrier 34 makes it possible to set the workpiece 38 to be machined in any arbitrary position relative to the grinding wheel, thus making it possible to set the workpiece 38 in any desired position relative to the grinding wheel, thus making it possible to create a complex and composite structure for the workpiece. Any profile can be ground.

According to the invention, a dressing device is provided for dressing the grinding wheel. This dressing device consists of two parts corresponding to the grinding spindles, depending on the number of grinding spindles. Of these parts, only the part of the dressing device 42 corresponding to the upper grinding spindle 12 can be seen in FIG.

As can be seen in FIG. 1, the dressing device 42 has a dressing tool 43 which is centered in the holding means 44 about an axis 46 parallel to the axis of the corresponding grinding spindle 12. Rotatably supported. This dressing tool 43 is driven by a motor 47. The detailed configuration of the dressing tool 43 will be described in detail below in conjunction with FIG.

The holding means 44 are slidably guided in a frame 48 parallel to the corresponding grinding spindle axis. A motor 49 serves to drive the holding means 44 parallel to the grinding spindle axis. The frame 48 itself is mounted on the grinding spindle carrier 3 so as to be movable radially relative to the axis of the corresponding grinding spindle 12 along longitudinal guide rails 51, 51'. This frame is the spindle drive section 52
It is driven by a motor 53 via. This structure of the dressing device allows the dressing tool 4
3 to the position required for dressing each of the grinding wheels. The dressing tool 43 is thereby provided with the necessary longitudinal and lateral movement possibilities.

The motor 54 is a drive for a lower dressing device, which is not visible in the drawing and is configured correspondingly to the dressing device 42.

FIG. 1 shows a grinding machine with two grinding spindles. These grinding spindles have a total of five grinding wheels. This is an excellent example of a machine. Of course, it is also possible for the grinding spindle to be equipped with more or fewer grinding wheels. This depends on the particular needs and requirements imposed by the grinding operation to be performed on the workpiece.

FIG. 2 is a schematic representation of details regarding the arrangement of the grinding spindle, the corresponding dressing tool and the workpiece carrier. The same parts are shown with the same numbers as in Figure 1, but the numbers have been increased to the 200s.

As can be seen from FIG. 2, in a preferred embodiment of the grinding machine according to the invention two grinding spindles 212, 213 are provided parallel to each other. These grinding spindles, as already mentioned in connection with FIG. 1, are rotatably cantilevered in a grinding spindle carrier which is arranged to be movable in the longitudinal direction. In FIG. 2, these bearings are designated 203, 204. The upper grinding spindle 212 has three grinding wheels 217, 21
It has a grinding head 214 consisting of 7a and 217b. The grinding wheel 217 located closest to the grinding spindle tip has the smallest diameter, and each subsequent grinding wheel in the direction of the grinding spindle axis has a larger diameter than the preceding grinding wheel. Grinding wheel 217a is therefore larger than grinding wheel 217, and grinding wheel 217b has a larger diameter than grinding wheel 217a. The lower grinding spindle 213 has two grinding wheels 21
It carries a grinding head 216 consisting of 8,218a. In this case as well, the grinding wheel 218 is provided with a smaller diameter at the spindle tip in front of the grinding wheel 218a which has a larger diameter. This arrangement of the grinding wheels and the step in their diameter in the direction of the tip of the grinding spindle ensure free access of the workpiece to the individual grinding wheels.

The grinding spindle is driven by motors 219 and 221.
It is done through.

Dressing tools 243, 256 are provided for dressing the grinding wheel. Dressing tool 2 corresponding to the upper grinding spindle 212
Reference numeral 43 is provided with one dressing wheel, and this dressing wheel is provided with different grinding wheels 217, 217a, 217b provided one after the other in the axial direction on the circumferential surface thereof in order to dress the different grinding wheels 217, 217a, 217b. three profiles 25
7,257a and 257b. The dressing tool 243 is mounted on a shaft 246, which is driven by a motor 247.
The dressing tool for the grinding wheel of the lower grinding spindle 213 is constructed in a completely corresponding manner. This dressing tool consists of a dressing wheel which carries on its circumferential surface two different profiles 258, 258a, corresponding to the number of grinding wheels to be dressed. Dressing tool 256 is driven by motor 259.

Figures 2a, 2b and 2c show special embodiments of the grinding head and the corresponding dressing tool. That is, FIG. 2a shows the upper grinding head 21.
No. 4 grinding wheels 217, 217a, 217b are shown in a partial cross-sectional view. In this case, it can be clearly seen that each of these grinding wheels has a different profile. Corresponding dressing tool 243
2, dressing wheels 261, 261a, which are arranged side by side on a common shaft 246 are different from FIG.
261b. Each of these dressing wheels has a dressing profile that corresponds to a corresponding grinding wheel. FIG. 2b also shows two grinding wheels 2 with different profiles.
Lower grinding head 216 with 18, 218a
is likewise shown in partial section. The grinding wheel of this grinding head has a dressing tool 25 having two dressing wheels 262, 262a.
6 is compatible. These dressing wheels have the necessary profile for dressing the grinding wheels 218, 218a.

Another configuration of the dressing tool is shown in FIG. 2c. In this case the upper grinding spindle 212
A dressing tool consisting of three dressing wheels 263, 263a and 263b is associated with the grinding head 214. The diameter of these dressing wheels is the same as that of the corresponding grinding wheel 21.
7, 217a, and 217b are stepped in accordance with their diameters. It is also possible to provide a dressing tool of similar design in the lower grinding head. The dressing tool shown in FIG. 2c allows simultaneous dressing of all grinding wheels of one grinding spindle.

Figure 2 further shows the deformation of the workpiece carrier with reference numeral 23.
4 is shown enlarged. This work carrier 2
34 consists of a turntable 264. This turntable has a double arrow 26 centered on the vertical axis.
It is mounted on a feed table designated by reference numeral 29 in FIG. 1 so as to be rotatable in directions 6. Rotation of the turntable 264 is performed by a motor 239. A rotating head 236 is supported in the turntail on a horizontal shaft 267 so as to be swingable in the direction of arrow 268. Pin 269 supports the rotary head in its desired position, and motor 271 supports horizontal shaft 2.
Serves as a drive for the axial movement of the pin 269 for the oscillating movement about 67. The workpiece holder 237, which holds the workpiece 238 in a corresponding fixing device, is centered on a horizontal axis by the double arrow 272.
It is rotatably supported within a rotating head 236 in the direction of . This work holder is driven by a motor 241.

By the grinding machine shown in Fig. 1 and Fig. 2,
Workpiece 38 or 238 to be machined in each case
It is possible to perform up to five grinding operations on the same. This means that the machining outlays required for grinding complex and synthetic profiles are significantly reduced by the invention compared to the prior art. By using more than five grinding wheels in a machine, the number of grinding operations that can be performed on one machine can be further increased. The grinding machine proposed according to the invention can therefore be optimally adapted to the respective requirements.

FIG. 3 shows a possible embodiment of the dressing device for both grinding heads. The same parts are shown with the same numbers as in Figure 1, but the digits have been increased to the 300s. Upper grinding spindle 312
and the lower grinding spindle 313 are slidably cantilevered parallel to one another in a grinding spindle carrier (not shown). Grinding spindle 312
are three grinding wheels 317, 317a and 317
It has a grinding head consisting of b. The diameter of these grinding wheels increases in the manner according to the invention from the tip of the grinding spindle. The upper grinding spindle 312 is driven by a motor 319. The lower grinding spindle 313 is a grinding wheel 318,3
It has a grinding head having a diameter of 18a. The lower grinding spindle is driven by a motor 321. In the embodiment of the machine proposed according to the invention shown in FIG. 3, the dressing tool is provided with its own dressing wheels, one for each grinding wheel; The wheels are arranged angularly offset around the circumference of the grinding spindle. Grinding wheel 31 on the upper grinding spindle 312
7, 317a, 317b are dressing tools 3
61, 361a, and 316b are provided correspondingly. Grinding wheel 3 of the lower grinding spindle 313
18, 318a is a dressing tool 362, 3
62a is correspondingly provided. Each dressing tool is rotatably attached to the holding means 344 about an axis parallel to the axis of the corresponding grinding spindle.
is supported by. The holding means 344 with the dressing tool are mounted on a cradle 348 which is slidable radially in the direction of the double arrow 373 relative to the axis of the corresponding grinding spindle. Dressing tools corresponding to other grinding wheels are held in a similarly constructed device, which therefore does not need to be described in detail here. However, all dressing tools can be slid around the grinding wheel in a radial direction relative to the axis of the grinding spindle, as indicated by the double arrows 374, 376, 377 and 378, in accordance with their position. I will only point out the following. This movement in the direction of the arrow brings the dressing tool into contact with the grinding wheel to be dressed.

FIG. 4 shows another embodiment of the machine according to the invention. The same parts are shown with the same numbers as in Figure 1, but the numbers have been increased to the 400s.

The grinding spindles 412, 413 are also arranged in grinding spindle carriers 403, 404 in this embodiment. These grinding spindle carriers are guided transversely to the axis of the grinding spindle along guide rails 406, 406' and are driven via screw drives 407, 408. The grinding spindle 412 has three grinding wheels 417, 417a, 417b driven by a motor 419. The grinding spindle 413 is connected to the motor 42
It supports grinding wheels 418, 418a which are driven by a motor. On the bed 401, the support 423 is slidably guided longitudinally by a screw drive 426 along guide rails 422, 422'. Support 423 is feed table 429
It carries This feed table is moved to the guide rail 4 by a motor 433 via a screw drive unit 432.
28,428'. A rotating head 436 is rotatably supported on the feed table about a vertical axis. Rotating head 436
It carries a work holder 437 which is rotatable about a horizontal axis. Work holding body 437
A workpiece 438 is secured within a suitable grip. As far as this is concerned, the configuration of this work carrier is
This corresponds to the configuration described in connection with the figure. In the embodiment shown in FIG. 4, in addition to the workpiece carrier 434, a dressing device 44
2 is provided. The shafts of two dressing tools 443, 456 are mounted in the holding block parallel to the grinding spindle axis. These dressing tools are equipped with motors 447, 459.
driven by. In the illustrated embodiment, the two dressing tools are parallel to each other. The upper dressing tool 443 has three profiles 457, 457a, 45 for dressing the grinding wheel of the upper grinding spindle 412.
7b. The lower dressing tool has profiles 458 and 458a for dressing both grinding wheels of the lower grinding spindle 413. This is a particularly simple construction of the machine according to the invention. In order to dress the grinding wheel, the feeding table is moved to the dressing device 44.
In the embodiment shown in conjunction with 2, it is moved to the right,
It is only necessary to bring the grinding wheels into contact with the corresponding dressing tools one after the other.

FIG. 4 shows two dressing tools 443,
A dressing device 442 having 456 is shown. This dressing device has a total of five different profiles. It is also possible to modify this embodiment to provide all five profiles for all five grinding wheels side by side on one dressing tool. This further reduces the mechanical engineering costs for the dressing device.

FIG. 5 shows a modification of the workpiece carrier seen in the direction of arrow V in FIG. The same parts are indicated by the same symbols as in FIG. However, the number was increased to 500 units. Work carrier 534 consists of a turntable 564 pivotable about a vertical axis carrying a rotating head 536 pivotable about horizontal axis 567, as in FIG. The rotary head 536 has a workpiece holder 537 rotatable about a horizontal axis in the direction of a double arrow 572.
is provided. In the embodiment shown in FIG. 5, this workpiece holder holds two workpieces 538, 53
It is equipped with two gripping parts for fixing 8'.
This embodiment of the machine proposed according to the invention allows a further rationalization of machining operations when grinding complex composite profiles.

FIG. 6 shows a typical workpiece that can be machined with the grinding machine proposed by the present invention. 6th
As shown, workpiece 638 has a series of profiles that each must be ground in a separate operation step. In order to machine this profile in the known technology, the workpiece must be fixed in a separate machine each time with a new tool. In the grinding machine proposed by the present invention, arrow 6 is shown in FIG.
Many of these profiles, such as those shown at 79, can be ground on the same machine. The number of profiles that can be ground with one machine depends on the number of grinding wheels present in the machine. This means that the machining of such complex workpieces with a complex and synthetic profile by means of the grinding machine proposed by the invention requires only a small mechanical and economical outlay and is therefore less technical. It is clear that it is extremely rational from both a physical and an economic point of view.

The grinding machine described as a preferred embodiment of the invention has separate motors as drives for the rotational movement of the workpiece carrier, the linear movement of the workpiece carrier and the linear movement of the grinding spindle carrier and of the dressing device. are doing. Providing the grinder with separate motors for each of these movements allows the grinder to operate under numerical control. Of course, it is also possible to drive some or all of the drives via manual screw elements or similar working devices. The screw drives provided in the above-mentioned embodiments of the machine for the support, the feed table, the dressing device frame and the grinding spindle carrier can be replaced by the frame according to the invention by other drive means performing the same function. It is also possible to replace without exiting. The provided guide rails can also be replaced by other guide means.

The drive is first of all provided with an electric drive. The grinding spindle drive is configured in such a way that the grinding spindle can be driven at different speeds. In order to achieve as uniform a circumferential speed of the grinding wheels as possible during grinding, the grinding spindle must be driven in such a way that it moves with a greater angular velocity when using small grinding wheels. As a result, even when grinding with grinding wheels having different diameters, a constant circumferential speed of the grinding wheels is achieved.

The essential advantages of the present invention are as follows.
This means that complex and composite profiles for workpieces with non-flat, complex surfaces can be ground on the same machine, which is not at all complex in terms of structure. Installation of workpieces between work processes,
There is no need for disassembly and therefore the number of possible sources of erroneous operation is reduced, resulting in precision machining and a significant reduction in machining time. This also enables economical and rational processing. The mechanical outlay required for grinding the composite profile is significantly reduced according to the invention by consolidating multiple grinding operations into one grinding machine. Only when the number of grinding operations to be carried out on one workpiece exceeds the number of grinding wheels of the machine does it become necessary to connect one or more other machines. The novel design of this machine therefore also makes it possible, for example, to carry out complex combined grinding operations on workpieces of complex shapes in a sequential manner with a high degree of precision, for example on a numerically controllable grinding machine.

[Brief explanation of the drawing]

1 is an overall diagram, not to scale, of a grinding machine according to the invention; FIG. 2 is a schematic representation of an embodiment of the grinding head, the corresponding dressing device and the workpiece carrier; FIGS. 2a, 2b and 2c; FIG. is a broken explanatory diagram of another embodiment of the dressing device, FIG. 3 is another arrangement diagram of the dressing device, FIG. 4 is another arrangement diagram of the dressing device, and FIG. 5 is a diagram of another embodiment of the work carrier. The detailed view, Figure 6, shows the workpiece to be machined. The symbols in the figure are 14, 16, 214, 216...
Grinding head, 12, 13, 212, 213, 31
2, 313, 412, 413...Grinding spindle, 17, 17a, 17b, 18, 18a; 21
7...218a; 417...418a...Grinding wheel,
42,442...Dressing device, 43,24
3,256,443,456... Dressing tool, 257,257a, 257b, 258,25
8a, 457, 457a, 457b, 458, 4
58a...Profile, 34,234,434,
534...Work carrier, 37,237,43
7,537... Work holding body.

Claims (1)

Claims: 1. Two grinding spindles cantilevered parallel to each other, having grinding wheels movable in the radial direction of the grinding spindles relative to each other along a column;
Like a turbine blade, it has a dressing device for dressing the grinding wheel and a workpiece carrier movable in the axial direction of the grinding spindle and tangentially to the circumferential surface of the grinding wheel on the bed carrying the column. In a grinding machine for profile grinding a workpiece having a complicated surface, the two grinding spindles 12, 13; 212, 21
3; 412, 413 are respectively cantilevered on two grinding spindle carriers 3, 4; 203, 204; A set of multiple grinding wheels 17, 17 with different diameters
a, 17b, 18, 18a; 217, 217a,
217b, 218, 218a; 417, 417
a, 417b, 418, 418a, each grinding wheel axially continuous from the distal end of a cantilevered grinding spindle having a diameter larger than the preceding grinding wheel; Dressing tool 43; 24
3,256; 443,456, the dressing tool has a complementary profile 25 corresponding to the profile of the associated grinding wheel.
7,257a,257b,258,258a;4
57, 457a, 457b, 458, 458a, and the workpiece carriers 34, 234, 434, 53
4 has a workpiece holder 37, 237, 437, 537 which has at least one workpiece grip and is rotatable about at least one axis; It is characterized in that individually controllable drive means are provided for driving each of the movements of the dressing tool, the axial and tangential movements of the workpiece carrier, and the rotational movement of the workpiece holder. Grinder. 2. A frame 48, 348 carrying a dressing device 42 on each of the grinding spindle carriers is slidably guided radially relative to the grinding spindle axis, said frame being guided parallel to the grinding spindle axis. a shaft 4 which is movable and capable of driving the dressing tools 43, 243, 256;
Holding means 44,344 carried on 6,246
and further comprising individually controllable drive means for the movement of the grinding spindle carrier and the frame and for the rotation of the dressing tool. The grinding machine described in section. 3 Grinding spindle 12, 212, 312, 41
2, one of the grinding spindles 13, 213, 313, 413 has two grinding wheels. Grinder. 4 Work holder 37, 237, 437, 537
a rotary head 36, 236 which has at least one workpiece grip and is rotatable about an axis perpendicular to the feed table 29, 429 and rotatable about an axis parallel to the grinding spindle axis; ，
436, 536, and the feed table 29, 429 is guided movably transversely to the grinding spindle axis on supports 23, 423 movable in a horizontal plane parallel to the grinding spindle axis. A grinding machine according to any one of claims 1 to 3, characterized in that: 5. Axis 267, 56 on which the rotary head 236, 536 runs horizontally transversely to the grinding spindle axis
Claim 4, characterized in that the turntable 264, 564 is supported on the feed table 29 so as to be pivotable about a vertical axis. Grinding machine mentioned. 6 Support 23 and feed table 29, 42
9 for linear movement, and turntables 264, 564, rotating heads 36, 236, 43.
6,536 and work holder 37,237,4
37,537 individually controllable drive means 27, 33, 433, 39, 239, 4 for rotational movement
1,242,271 is provided, The grinding machine according to claim 5, characterized in that the grinding machine is provided with: 1,242,271. 7. Grinding machine according to any one of claims 1 to 6, characterized in that each of the grinding wheels supported on the grinding spindle has a different profile. 8. Claim 1, characterized in that the dressing tool has complementary profiles on its circumferential surface, axially next to each other, corresponding to the profiles of all grinding wheels of the corresponding grinding spindle. The grinding machine described in any one of items 7 to 7. 9. That the dressing tool has one dressing wheel for each grinding wheel of the corresponding grinding spindle, and that these dressing wheels are offset in angular position relative to each other so as to cover the circumferential surface of the grinding wheel. Claims 1 to 7 are characterized in that they are provided along
A grinding machine as described in any one of the preceding paragraphs. 10 A dressing tool corresponding to one grinding spindle is connected to each grinding wheel 217 on a common axis.
217a, 217b, and that the diameters of these dressing wheels are stepped to correspond to the diameter of the corresponding grinding wheel. A grinding machine according to any one of claims 1 to 7. 11. Any one of claims 4 to 10, characterized in that one or two dressing tools 443, 456 corresponding to the grinding spindle are provided on the feed table 429. The grinding machine described in . 12. A common dressing device is provided for the grinding wheels of the two grinding spindles, characterized in that the dressing tool of this dressing device has the dressing profile of all the grinding wheels of both grinding spindles. A grinding machine according to any one of claims 1 to 11. 13. Any one of claims 1 to 12, characterized in that the workpiece holder 537 has two workpiece grips that are shifted by 180 degrees with respect to its rotational axis. Grinding machine mentioned in one. 14. Any one of claims 1 to 13, characterized in that the workpiece fixed to the workpiece holder is sequentially movable in the direction of the grinding wheel to the working position by the workpiece holder. The grinding machine mentioned in one of the above. 15. Grinding machine according to any one of claims 1 to 14, characterized in that the grinding spindle can be driven with a variable angular velocity. 16. The grinding machine according to any one of claims 1 to 15, characterized in that an individually controllable electric drive is provided as the drive means.